I'm sure this has been covered before, but what's the max unsupported memory for a 2009 Mac mini? Is it 8GB or 16GB before it actually starts doing some harm to performance. I just picked up a used one up on Craigslist a couple days ago. I kinda remember reading something about it a while back.

I'm sure this has been covered before, but what's the max unsupported memory for a 2009 Mac mini? Is it 8GB or 16GB before it actually starts doing some harm to performance. I just picked up a used one up on Craigslist a couple days ago. I kinda remember reading something about it a while back.

2x4GB should work.
Note that you may first need to upgrade to the latest Mac Mini firmware if you have one of the early Mac Mini 2009 (mine is : MM31.00AD.B00 ; SMC : 1.35f1).
Making the Mac Mini recognize the 4GB SIMMs may also be a bit tricky : read Carl V. post which worked for me.